mirror of http://shamusworld.gotdns.org/git/rmac
215 lines
8.1 KiB
C
215 lines
8.1 KiB
C
//
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// RMAC - Renamed Macro Assembler for all Atari computers
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// SECT.H - Code Generation, Fixups and Section Management
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// Copyright (C) 199x Landon Dyer, 2011-2021 Reboot and Friends
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// RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
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// Source utilized with the kind permission of Landon Dyer
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//
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#ifndef __SECT_H__
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#define __SECT_H__
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#include "rmac.h"
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#include "riscasm.h"
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// Macros to deposit code in the current section (in Big Endian)
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#define D_byte(b) {chcheck(1);*chptr++=(uint8_t)(b); sloc++; ch_size++; \
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if(orgactive) orgaddr++;}
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#define D_word(w) {chcheck(2);*chptr++=(uint8_t)((w)>>8); \
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*chptr++=(uint8_t)(w); \
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sloc += 2; ch_size += 2; if(orgactive) orgaddr += 2;}
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#define D_long(lw) {chcheck(4);*chptr++=(uint8_t)((lw)>>24); \
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*chptr++=(uint8_t)((lw)>>16);\
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*chptr++=(uint8_t)((lw)>>8); \
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*chptr++=(uint8_t)(lw); \
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sloc += 4; ch_size += 4; if(orgactive) orgaddr += 4;}
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#define D_quad(qw) {chcheck(8);*chptr++=(uint8_t)((qw)>>56); \
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*chptr++=(uint8_t)((qw)>>48);\
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*chptr++=(uint8_t)((qw)>>40);\
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*chptr++=(uint8_t)((qw)>>32);\
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*chptr++=(uint8_t)((qw)>>24);\
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*chptr++=(uint8_t)((qw)>>16);\
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*chptr++=(uint8_t)((qw)>>8); \
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*chptr++=(uint8_t)(qw); \
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sloc += 8; ch_size += 8; if(orgactive) orgaddr += 8;}
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// D_rword deposits a "6502" format (low, high) word (01).
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#define D_rword(w) {chcheck(2);*chptr++=(uint8_t)(w); \
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*chptr++=(uint8_t)((w)>>8); \
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sloc+=2; ch_size+=2;if(orgactive) orgaddr += 2;}
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// Macro for the 56001. Word size on this device is 24 bits wide. I hope that
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// orgaddr += 1 means that the addresses in the device reflect this. [A: Yes.]
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#define D_dsp(w) {chcheck(3);*chptr++=(uint8_t)(w>>16); \
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*chptr++=(uint8_t)(w>>8); *chptr++=(uint8_t)w; \
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sloc+=1; ch_size += 3; if(orgactive) orgaddr += 1; \
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dsp_written_data_in_current_org=1;}
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// This macro expects to get an array of uint8_ts with the hi bits in a[0] and
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// the low bits in a[11] (Big Endian).
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#define D_extend(a) {chcheck(12); memcpy(chptr, a, 12); chptr+=12; sloc+=12, \
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ch_size+=12; if (orgactive) orgaddr+=12;}
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// Fill n bytes with zeroes
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#define D_ZEROFILL(n) {chcheck(n); memset(chptr, 0, n); chptr+=n; sloc+=n; \
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ch_size+=n; if (orgactive) orgaddr+=n;}
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//OK, this is bad, mmkay? The constants defined in rmac.h are used as indices into an array which means that this was never meant to be defined this way--at least if it was, it was a compromise that has come home to bite us all in the ass. !!! FIX !!!
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//#define NSECTS 16 // Max. number of sections
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#define NSECTS 256 // Max. number of sections
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// Tunable (storage) definitions
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#define CH_THRESHOLD 32 // Minimum amount of space in code chunk
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#define CH_CODE_SIZE 4096 // Code chunk normal allocation (4K)
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// Section attributes (.scattr)
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#define SUSED 0x8000 // Section is used (really, valid)
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#define SBSS 0x4000 // Section can contain no data
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#define SABS 0x2000 // Section is absolute
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#define SPIC 0x1000 // Section is position-independent code
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// FIXUP attributes
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#define FUMASK 0x000F // Mask for fixup cases:
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#define FU_QUICK 0x0000 // Fixup 3-bit quick instruction field
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#define FU_BYTE 0x0001 // Fixup byte
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#define FU_WORD 0x0002 // Fixup word
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#define FU_WBYTE 0x0003 // Fixup byte (at loc+1)
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#define FU_LONG 0x0004 // Fixup long
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#define FU_BBRA 0x0005 // Fixup byte branch
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#define FU_6BRA 0x0007 // Fixup 6502-format branch offset
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#define FU_BYTEH 0x0008 // Fixup 6502 high byte of immediate word
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#define FU_BYTEL 0x0009 // Fixup 6502 low byte of immediate word
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#define FU_QUAD 0x000A // Fixup quad-word (8 bytes, typically OP)
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#define FU_56001 0x000B // Fixup code for all 56001 modes
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#define FU_SEXT 0x0010 // Ok to sign extend
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#define FU_PCREL 0x0020 // Subtract PC first
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#define FU_PCRELX 0x1000000 // 030 variant
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#define FU_EXPR 0x0040 // Expression (not symbol) follows
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#define FU_GLOBAL 0x0080 // Mark global symbol
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#define FUMASKRISC 0x0F00 // Mask for RISC fixup cases
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#define FU_MOVEI 0x0100
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#define FU_JR 0x0200
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#define FU_REGONE 0x0400
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#define FU_NUM15 0x0500
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#define FU_NUM31 0x0600
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#define FU_NUM32 0x0700
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#define FU_REGTWO 0x0800
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#define FU_SUB32 0x1000
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#define FU_ISBRA 0x2000 // Word forward fixup is a BRA or DBRA
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#define FU_LBRA 0x4000 // Long branch, for short branch detect
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#define FU_DONE 0x8000 // Fixup has been done
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// FPU fixups
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#define FU_FLOATSING 0x000D // Fixup 32-bit float
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#define FU_FLOATDOUB 0x000E // Fixup 64-bit float
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#define FU_FLOATEXT 0x000F // Fixup 96-bit float
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// OP fixups
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#define FU_OBJLINK 0x10000 // Fixup OL link addr (bits 24-42, drop last 3)
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#define FU_OBJDATA 0x20000 // Fixup OL data addr (bits 43-63, drop last 3)
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// DSP56001 fixups
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#define FUMASKDSP 0xF00000 // Mask for DSP56001 fuckups^Wfixups
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#define FU_DSPIMM5 0x100000 // Fixup 5-bit immediate
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#define FU_DSPADR12 0x200000 // Fixup 12-bit address
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#define FU_DSPADR24 0x300000 // Fixup 24-bit address
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#define FU_DSPADR16 0x400000 // Fixup 16-bit address
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#define FU_DSPIMM12 0x500000 // Fixup 12-bit immediate
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#define FU_DSPIMM24 0x600000 // Fixup 24-bit immediate
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#define FU_DSPIMM8 0x700000 // Fixup 8-bit immediate
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#define FU_DSPADR06 0x800000 // Fixup 6-bit address
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#define FU_DSPPP06 0x900000 // Fixup 6 bit pp address
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#define FU_DSPIMMFL8 0xA00000 // Fixup 8-bit immediate float
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#define FU_DSPIMMFL16 0xB00000 // Fixup 16-bit immediate float
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#define FU_DSPIMMFL24 0xC00000 // Fixup 24-bit immediate float
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// Chunks are used to hold generated code and fixup records
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#define CHUNK struct _chunk
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CHUNK {
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CHUNK * chnext; // Next, previous chunks in section
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CHUNK * chprev;
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uint32_t chloc; // Base addr of this chunk
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uint32_t challoc; // # bytes allocated for chunk
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uint32_t ch_size; // # bytes chunk actually uses
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uint8_t * chptr; // Data for this chunk
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};
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// Fixup records can also hold an expression (if any)
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#define FIXUP struct _fixup
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FIXUP {
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FIXUP * next; // Pointer to next FIXUP
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uint32_t attr; // Fixup type
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uint32_t loc; // Location in section
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uint16_t fileno; // ID of current file
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uint32_t lineno; // Current line
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TOKEN * expr; // Pointer to stored expression (if any)
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SYM * symbol; // Pointer to symbol (if any)
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uint32_t orgaddr; // Fixup origin address (used for FU_JR)
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};
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// Section descriptor
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#define SECT struct _sect
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SECT {
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uint16_t scattr; // Section attributes
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uint32_t sloc; // Current loc-in / size-of section
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uint32_t relocs; // # of relocations for this section
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uint32_t orgaddr; // Current org'd address ***NEW***
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CHUNK * sfcode; // First chunk in section
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CHUNK * scode; // Last chunk in section
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FIXUP * sffix; // First fixup
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FIXUP * sfix; // Last fixup ***NEW***
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};
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// 680x0 defines
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#define CPU_68000 1
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#define CPU_68020 2
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#define CPU_68030 4
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#define CPU_68040 8
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#define CPU_68060 16
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#define FPU_NONE 0
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#define FPU_68881 1
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#define FPU_68882 2
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#define FPU_68040 4
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#define FPU_68060 8
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// Helper macros to test for active CPU
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#define CHECK00 if (activecpu == CPU_68000) return error(unsupport)
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#define CHECK20 if (activecpu == CPU_68020) return error(unsupport)
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#define CHECK30 if (activecpu == CPU_68030) return error(unsupport)
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#define CHECK40 if (activecpu == CPU_68040) return error(unsupport)
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#define CHECK60 if (activecpu == CPU_68060) return error(unsupport)
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#define CHECKNO00 if (activecpu != CPU_68000) return error(unsupport)
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#define CHECKNO20 if (activecpu != CPU_68020) return error(unsupport)
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#define CHECKNO30 if (activecpu != CPU_68030) return error(unsupport)
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#define CHECKNO40 if (activecpu != CPU_68040) return error(unsupport)
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#define CHECKNO60 if (activecpu != CPU_68060) return error(unsupport)
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#define CHECKNOFPU if (!activefpu) return error(unsupport)
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// Globals, external etc
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extern uint32_t sloc;
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extern uint16_t scattr;
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extern uint8_t * chptr;
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extern uint8_t * chptr_opcode;
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extern uint32_t ch_size;
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extern int cursect;
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extern SECT sect[];
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extern uint32_t challoc;
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extern CHUNK * scode;
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// Prototypes
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void InitSection(void);
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void SwitchSection(int);
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void SaveSection(void);
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int fixtest(int, uint32_t);
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void chcheck(uint32_t);
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int AddFixup(uint32_t, uint32_t, TOKEN *);
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int ResolveAllFixups(void);
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#endif // __SECT_H__
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